C Warning - assignment discards qualifiers from pointer target type

/*
 * Registrar structure information
 */
struct MTS_REGISTRAR_STRUCT_T
{
    MTS_SERVICE_ACCESS_POINT_T* pt_SAP;
    MTS_NODE_ID_T mt_NodeId;
    MTS_SUBJECT_ID_T mt_SubjectId;
    void* p_Buffer;
    SIZE_T t_BufferSize;
    void (*pt_CallBack)
    (
        MTS_SERVICE_ACCESS_POINT_T* pt_SAP,
        MTS_CALLBACK_DATA_T* pt_CallbackData,
        SOIS_STATUS_T* pt_Return
    );
    PRIORITY_T t_Priority;
    SOIS_QoS_T t_QoS;
    void* pt_Param;
};

void sois_mts_sap_init
(
    MTS_SERVICE_ACCESS_POINT_T *pt_SAP,
    MTS_MIB_T* pt_MIB,
    const APPLICATION_ID_T t_AppID,
    const void* pt_Param,
    SOIS_STATUS_T* pt_Result
)
{
    // If there is an error incoming, exit and propagate to the next
    if(*pt_Result != SOIS_STATUS_SUCCESS)
    {
            return;
    }
    // Assign MIB pointer
    pt_SAP->pt_MIB = pt_MIB;
    pt_SAP->mt_Id = t_AppID;
    pt_SAP->pt_Param = pt_Param;

}